[Jim Sims]

I'd remove the plugs and see if the engine can be turned over by hand. If not, you may have a valve timing problem or a seized bearing. There is a possibility a bearing did not get oil (I'm assuming the engine was put back together with assembly lube and all the bearing clearances were checked with plastigage or equivalent) or was contaminated with polishing compound or had all the lubrication washed off or the oil diluted by gasoline from excessive cranking with the fuel system running or the fuel system running when the ignition is on without the engine running (CIS air flow switch disconnected or defective). The gasoline problem is less likely but still a possibility. Good luck, Jim